[encoding/googlecloudlogentry] Add support for VPC Flow Log MIGs / Service Metadata

[andrewvc]

Component(s)

extension/encoding/googlecloudlogentryencoding

Is your feature request related to a problem? Please describe.

In the Google cloud log entry encoding extension, we currently support VPC flow logs to a degree. However, we are missing key MIG and Service fields. These fields identify which MIGs the traffic is flowing to/from and which GCP services as well.

Describe the solution you'd like

We could solve this by adding the fieldsgcp.vpc.flow.{source,destination}.google_service.{type,name,connectivity} and gcp.vpc.flow.{source,destination}.instance.managed_instance_group.region. These are currently marked as unsupported.

Note: A list of currently supported/unsupported fields for the above is found in this README.

Describe alternatives you've considered

None

Additional context

None

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[github-actions]

Pinging code owners:

• extension/encoding/googlecloudlogentryencoding: @constanca-m

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